<?php
/**
 * Created by Green Studio.
 * File: Uploader.class.php
 * User: TianShuo
 * Date: 14-1-27
 * Time: 上午9:26
 */

namespace Common\Util;


/**
 * Class Uploader
 * 目前只有Ueditor在使用
 * 计划在3个月内移除
 * @package Common\Util
 */
class Uploader
{
    /**
     * @var string
     */
    private $fileField; //文件域名
    /**
     * @var
     */
    private $file; //文件上传对象
    /**
     * @var array
     */
    private $config; //配置信息
    /**
     * @var
     */
    private $oriName; //原始文件名
    /**
     * @var
     */
    private $fileName; //新文件名
    /**
     * @var
     */
    private $fullName; //完整文件名,即从当前配置目录开始的URL
    /**
     * @var
     */
    private $fileSize; //文件大小
    /**
     * @var
     */
    private $fileType; //文件类型
    /**
     * @var
     */
    private $stateInfo; //上传状态信息,
    /**
     * @var array
     */
    private $stateMap = array( //上传状态映射表，国际化用户需考虑此处数据的国际化
        "SUCCESS", //上传成功标记，在UEditor中内不可改变，否则flash判断会出错
        "文件大小超出 upload_max_filesize 限制",
        "文件大小超出 MAX_FILE_SIZE 限制",
        "文件未被完整上传",
        "没有文件被上传",
        "上传文件为空",
        "POST"    => "文件大小超出 post_max_size 限制",
        "SIZE"    => "文件大小超出网站限制",
        "TYPE"    => "不允许的文件类型",
        "DIR"     => "目录创建失败",
        "IO"      => "输入输出错误",
        "UNKNOWN" => "未知错误",
        "MOVE"    => "文件保存时出错"
    );

    /**
     * 构造函数
     * @param string $fileField 表单名称
     * @param array $config  配置项
     * @param bool $base64  是否解析base64编码，可省略。若开启，则$fileField代表的是base64编码的字符串表单名
     */
    public function __construct($fileField, $config, $base64 = false)
    {
        $this->fileField = $fileField;
        $this->config = $config;
        $this->stateInfo = $this->stateMap[0];
        $this->upFile($base64);
    }

    /**
     * 上传文件的主处理方法
     * @param $base64
     *
     * @return mixed
     */
    private function upFile($base64)
    {
        //处理base64上传
        if ("base64" == $base64) {
            $content = $_POST[$this->fileField];
            $this->base64ToImage($content);
            return;
        }

        //处理普通上传
        $file = $this->file = $_FILES[$this->fileField];
        if (!$file) {
            $this->stateInfo = $this->getStateInfo('POST');
            return;
        }
        if ($this->file['error']) {
            $this->stateInfo = $this->getStateInfo($file['error']);
            return;
        }
        if (!is_uploaded_file($file['tmp_name'])) {
            $this->stateInfo = $this->getStateInfo("UNKNOWN");
            return;
        }

        $this->oriName = $file['name'];
        $this->fileSize = $file['size'];
        $this->fileType = $this->getFileExt();

        if (!$this->checkSize()) {
            $this->stateInfo = $this->getStateInfo("SIZE");
            return;
        }
        if (!$this->checkType()) {
            $this->stateInfo = $this->getStateInfo("TYPE");
            return;
        }
        $this->fullName = $this->getFolder() . '/' . $this->getName();


        if ($this->stateInfo == $this->stateMap[0]) {


            if (!defined('SAE_TMP_PATH')) {
                // 非SAE环境中
                if (!move_uploaded_file($file["tmp_name"], $this->fullName)) {
                    $this->stateInfo = $this->getStateInfo("MOVE");
                }
            } else {
                // SAE环境中
                $st = new \SaeStorage();
                $url = $st->upload('upload', $this->fullName, $file["tmp_name"]);
                if (!$url) {
                    $this->stateInfo = $this->getStateInfo("MOVE");
                } else {


                    $this->fullName = str_replace('/http', 'http', $url);
                }
            }


        }
    }

    /**
     * 处理base64编码的图片上传
     *
     * @param $base64Data
     *
     * @return mixed
     */
    private function base64ToImage($base64Data)
    {
        $img = base64_decode($base64Data);
        $this->fileName = time() . rand(1, 10000) . ".png";
        $this->fullName = $this->getFolder() . '/' . $this->fileName;
        if (!file_put_contents($this->fullName, $img)) {
            $this->stateInfo = $this->getStateInfo("IO");
            return;
        }
        $this->oriName = "";
        $this->fileSize = strlen($img);
        $this->fileType = ".png";
    }

    /**
     * 获取当前上传成功文件的各项信息
     * @return array
     */
    public function getFileInfo()
    {
        return array(
            "originalName" => $this->oriName,
            "name"         => $this->fileName,
            "url"          => $this->fullName,
            "size"         => $this->fileSize,
            "type"         => $this->fileType,
            "state"        => $this->stateInfo
        );
    }

    /**
     * 上传错误检查
     * @param $errCode
     *
     * @return string
     */
    private function getStateInfo($errCode)
    {
        return !$this->stateMap[$errCode] ? $this->stateMap["UNKNOWN"] : $this->stateMap[$errCode];
    }

    /**
     * 重命名文件
     * @return string
     */
    private function getName()
    {
        return $this->fileName = time() . rand(1, 10000) . $this->getFileExt();
    }

    /**
     * 文件类型检测
     * @return bool
     */
    private function checkType()
    {
        return in_array($this->getFileExt(), $this->config["allowFiles"]);
    }

    /**
     * 文件大小检测
     * @return bool
     */
    private function  checkSize()
    {
        return $this->fileSize <= ($this->config["maxSize"] * 1024);
    }

    /**
     * 获取文件扩展名
     * @return string
     */
    private function getFileExt()
    {
        return strtolower(strrchr($this->file["name"], '.'));
    }

    /**
     * 按照日期自动创建存储文件夹
     * @return string
     */
    private function getFolder()
    {
        $pathStr = $this->config["savePath"];
        if (strrchr($pathStr, "/") != "/") {
            $pathStr .= "/";
        }
        $pathStr .= date("d");
        if (!defined('SAE_TMP_PATH')) {
            if (!file_exists($pathStr)) {
                if (!mkdir($pathStr, 0777, true)) {
                    //return false;

                    if (!file_exists($pathStr)) {
                        if (!mkdir($pathStr, 0777, true)) {
                            return false;
                        }
                    }
                }
            }
        }
        return $pathStr;
    }
}